AIO that I caught my boyfriend saying I love you to another girl

He had her saved in his phone as “Kyle bossmanne” I texted her and she thought I had listened in on their phone call. She was asking him to check on her ex, which is my bf’s friend. But why the f@ck save her as a guys name.

They are both acting like I am completely insane for being upset by it. He even apologized to her and told her he was so embarrassed by my immature actions and I showed him how I really feel (cuz I went through his iPad). He told me I’m disrespectful and he did nothing wrong. He told me I’m the biggest narcissist he ever met and accused me of being the reason my relationships don’t last (he knows I have massive trauma from emotional abuse).

Later he told me he wanted to try one last time to make us work, but I have to trust him and if I ever touch his phone again he’s out.

Am I overreacting?

In my opinion, maybe a “luv ya” or similar variation would be acceptable…. But “I love you”